Halogen’s Drinking Water Sensor, the MP5™, is now the only chlorine sensor awarded NSF 61 certification for installation directly in a drinking water line. The MP5™ is a compact sensor that measures free chlorine, pH, Conductivity, and Temperature. No waste stream is required saving tens of thousands of gallons of water per sensor per year. The MP5™ does not use any membrane, reagent, or electrolytes, reducing operating costs and maintenance